Design, configuration and points for attention of network specified source multicast (SSM) simulation using OPNET

About multicast in OPNET Configuration in , In the previous article on arbitrary source multicast （《 utilize OPNET Carry out network arbitrary source multicast (ASM) Design of simulation 、 Configuration and precautions 》） Has been introduced in , Here we mainly talk about the difference between the configuration of arbitrary source multicast and specified source multicast .

1、 The use of IP Different segments

as everyone knows , Specify the source multicast address and any source multicast address , There is a clear distinction , In short , Specify the source multicast using 232.XX.XX.XX The address of the segment . therefore , To configure the specified source multicast address , The first thing to do is to use 232 Multicast address of network segment .

2、IGMP Use v3 edition

Specify the source or any source , It's the same in other places , The biggest difference should be in the way multicast members join multicast , Any source uses IGMPv2, The specified source multicast uses IGMPv3. As long as you can join the multicast group , There is no big difference in the follow-up .IGMPv2 When joining a multicast group , It does not specify where to receive multicast data , and IGMPv3 Then the source is specified .
We will configure the data receiving terminal IGMPv3, And write the specified source multicast address on the receiving terminal , But actually , The purpose of this operation is to join a multicast group nearby , Support nearby IGMP Protocol router （ Or switches ） Generate multicast routing table , Its purpose is to make the configuration take effect in the router （ Or switches ） On , therefore , We can assign the specified source address , Directly configured in the router （ Or switches ） On .
Terminal receiving data , Will support nearby IGMP Protocol router （ Or switches ） On , Trying to join a multicast group , therefore , It should be adjacent to the data receiving terminal （ Not necessarily direct , There may also be a layer-2 switch in the middle , Hub or something ） The router （ Or switches ） Start to submit the application to join the multicast group . therefore , In the following topology , Should be router Join the multicast group on （ Because it is used in the figure switch It is a layer-2 switch , I won't support it IGMP agreement ）.

therefore , belong router Router and switch On the connected port , Configuration support IGMPv3 agreement , And specify the source address specified when the device in the LAN receives data . Do the following ：

1. modify IGMP Version is v3.
2. Specify multicast address ,232.0.6.1.
3. Specify the source address , among 192.0.2.2 Is the address of the data sending server .